Do that....
a) and you'll regret it.
b) if it 'll help
c) if you'll get the opportunity
d) - we' ll lose business

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(d) is probably right, but an American would not normally say it that way. Instead we would say 'Do that AND we'll lose business.' Actually, he would say it like this:

'Do that'n we'll lose bizness."

(c) The future doesn't fit, because in this case the opportunity is coming BEFORE you take action. That is, the 'opportunity' is a PREREQUISITE for taking action. Whereas, the other three cases deal with CONSEQUENCES that come AFTER you take some action. In other words you could say something like:

(d) is probably right, but an American would not normally say it that way. Instead we would say 'Do that AND we'll lose business.' Actually, he would say it like this:

'Do that'n we'll lose bizness."

(c) The future doesn't fit, because in this case the opportunity is coming BEFORE you take action. That is, the 'opportunity' is a PREREQUISITE for taking action. Whereas, the other three cases deal with CONSEQUENCES that come AFTER you take some action. In other words you could say something like: